Pab pawg Network-WDM Kev sib kis xaib
CWDM kev siv dav siv hauv DWDM kev kaw lus. Vim tias qhov zoo ntawm CWDM thev naus laus zis yog nws siv tus nqi qis heev tsis muaj qhov txias ntawm qhov kev tawm tswv yim lasers thiab cov ntxaij lim dej tsis tshua muaj siab dhau.
Ntxiv mus, yog tias siv cov CWDM thev naus laus zis, nws yog qhov tsim nyog los siv cov nqi sib kis pheej yig dua. Txawm li cas los xij, vim muaj qhov kis tau CWDM channel loj heev, yog li cov xov tooj ntawm lub nthwv dej muaj rau hauv qhov system yuav raug txo kom tsawg, qhov no tseem txwv tsis pub kis tau ntawm lub system.
Hauv qhov tam sim no ITU G.694.2, nrog 20nm sib nrug, tom qab ntawd tuaj yeem haum txog 18 CWDM wavelengths. Rau ntau daim ntawv thov, cov qauv dav dav ib hom fiber ntau (SSF) nyob rau hauv uas yim poob nthav ploj yuav loj heev. Yog li, raws li G.694.2 CWDM thev naus laus zis tsuas yog siv yim lub voos kab hluav taws xob hauv SSF, lawv yog 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm thiab 1610nm. Txog tam sim no, ntev li ntev tau cov neeg siv khoom ntawm WDM cov kev sib txuas lus xav tau ntau cov kev xaib, koj yuav tsum hloov pauv mus siv DWDM. Vim tias DWDM wavelength me ntu, tso cai rau ntau qhov chaw nce (feem ntau muaj 32,64,128 raws), thiab cov ntu kev sib kis tau mus txog 200, 100, lossis tseem 50GHz, tab sis tus nqi rau ib qho channel tau nce ntau. Yog li, cov neeg siv khoom yuav tsum ntsuas lawv qhov kev lag luam hauv kev txhim kho yav tom ntej ntawm qhov xwm txheej, los txiav txim siab ntawm tus nqi qis dua ntawm kev teeb tsa yooj yim kuj tsis zoo CWDM system, lossis rau kev pib ua haujlwm siab dua ntawm kev teeb tsa yooj dua DWDM systems.
Hauv kev txiav txim siab ntawm cov xwm txheej hauv qab no, "DWDM" yog hais tshwj xeeb rau cov channel qhov sib txawv ntawm 100GHz DWDM systems. Ib qho ntxiv, tus nqi sib txawv ntawm CWDM thiab DWDM systems feem ntau nyob hauv 20% txog 40% ntawm.
Qhia hauv Daim Duab 1 uas tau hais los saum toj no yog siv dav dav CWDM wavelengths, qhov seem ntawm cov channel yog 20nm. Thaum siv SFF kis, qhov channel sab nraud 1470-1610nm, lub teeb attenuation yuav muaj zog zuj zus. Yog li no, txhawm rau kom ua tiav qhov kev xa mus tau zoo, CWDM hac tsuas yog qhov siab tshaj ntawm yim wavelengths. Hauv kev sib piv, DWDM hauv C-band thiab L-band txawm tias ntau qhov ntau thiab tsawg ntawm qhov muaj cov yeeb yaj kiab tseem tuaj yeem siv cov kab kev channel me me. Piv txwv li ntawm 100GHz DWDM, nws ob lub sijhawm ntawm cov kem uas nyob ib sab yog feem ntau txog 0.8nm, tom qab ntawd tsawg kawg koj tuaj yeem muaj 64 raws - muaj 32 hauv C-band raws, ntxiv rau 32 L-band channels (Muaj qee qhov hauv hauv L-band tuaj yeem muaj ntau txoj hauv kev).
Tib-theem CWDM system yog kho rau DWDM system
Ob peb WDM cov cuab yeej siv khoom tuaj yeem muab cov khoom hloov pauv ntawm CWDM thiab DWDM txoj kev, qhov lawv siv yog thaum txhua qhov muaj peev xwm nruab tau CWDM system yuav tsum tau nthuav dav, kom nthuav dav siv DWDM lim rau txhua qhov channel CWDM ports. Qhia hauv daim duab 1, koj tuaj yeem muaj txog yim ntu ntawm 100GHz DWDM raws sib haum rau CWDM channel. Yog li ntawd, cov ntsiab cai ntawm CWDM channel mus txog qhov sib npaug ntawm yim DWDM raws. Qhov teeb meem loj tshaj plaws ntawm tus qauv no yog tias, ntawm ib sab tsis yog txhua tshooj CWDM tuaj yeem sib tshooj hauv qhov pom nrog cov xov tooj DWDM channel, lwm txog 50% ntawm DWDM raws li nrog lub khawb band ntug thiab / lossis lim CWDM (xub liab ) sib tshooj thiab tsis tuaj yeem siv. Yim-channel CWDM kev ua haujlwm tau pom nyob hauv Rooj Lus 1 kom nce qib DWDM kev hloov kho.
Peb xav tias qhov tshwj xeeb ntawm cov khoom tshwj xeeb ntawm kev ua haujlwm nquag thiab lub siab xav tau yog qhov tsim nyog, tom qab ntawd los ntawm kev xam qhov yooj yim ntawm cov teeb meem pom kev tshem tawm peb tau txais cov duab hauv Table 1. Hauv cov phiaj xwm no, cov naj npawb ntawm ntau txoj kab uas tuaj yeem ua tiav yog 32. Nws yog qhov tseem ceeb tshaj plaws tias, nyob hauv CWDM lim qauv, txhua kauj ruam yuav ua kom hloov cov kab hluav taws xob tiv thaiv, vim tias cov khoom siv nquag tau hloov rau CWDM DWDM wavelength thaum lub sijhawm hloov kho. Hauv lwm qhov xwm txheej, kev siv ob lim CWDM kev xa cov qauv. Cov kauj ruam no tso cai rau tus neeg siv txhim kho cov kev pabcuam hauv kev ua tiav DWDM wavelengths, thaum muab piv nrog cov theem ib tus qauv tuaj yeem ua tiav cov kev hloov pauv siab hauv channel.
CWDM system band qauv
Ob-theem kev lim dej qauv raws li nthwv dej bandwidth feem ntau siv rau hauv DWDM cov tshuab. Kev siv lub ntsiab ntawm cov txuj ci no hauv kev qhia cov tswv yim rau hauv nruab nrab wavelength channel pawg, tseem hu ua bandwidth channel kom ua tiav siab kho qhov muag rho tawm. Vim tias ntau qhov ntawm nev sib txuas tag nrho cov fais fab kho qhov muag tau sib txawv heev, nws yuav tsum tau ua kom thiaj li txhawb nqa kev sib cais kho qhov muag teeb liab yuam kev tsis raug xa mus rau ntau lub network. Tab sis kuj tseem muab lub taub lim dej rau txhua lub nthwv dej bandwidth kom zoo dua qhov kev sib sib zog nqus qhov system ntau ntxiv, uas tuaj yeem txo peev txheej, ua kom yooj yim hloov kho wavelength.
Qhia hauv qab no, yog siv cov tswvyim no rau rooj plaub ntawm bandwidth ntawm 2 CWDM system. Hauv qhov ua piv txwv no, peb yuav muaj yim tshooj ua ob txoj hlua, A thiab B, txhua qhov muaj plaub CWDM wavelengths (Ib pawg, 1470,1490,1590,1610nm; B band, 1510,1530,1550,1570nm). Ib pawg ntawm nthwv cua nyob hauv B B pawg yam ntxwv muab faib rau ob tog. Hauv kev siv tswv yim, kev siv band-hla lim yuav muab faib ua A thiab B ntawm ob txoj kab sib npaug. Band kis tau lim kis tau siv rau kis tau tus mob raws cov qauv raws CWDM channel lim teeb. Raws li pom hauv daim duab 2, qhov tseem ceeb tshaj plaws ntawm cov txheej txheem ntawm no uas ua tiav qhov B band DWDM C-band (cim nrog cov cim liab). Yog li no, thaum lub A-band siv CWDM thiab DWDM C-band yog ua tau. Ib qho ntxiv, B-band dua siv cov txheej txheem ntawm plaub CWDM wavelengths, plaub txoj kab hluav taws xob hauv cov kho qhov muag tau siv dav ntau xyoo. Nws tuaj yeem hais tau tias, feem ntau, qhov kev ntsuas no ntawm cov teeb tsa sub-band pab txhawb rau txhua qhov passive optical devices tshwm sim hauv khw, tab sis kuj tseem tso cai siv cov qauv CWDM thiab DWDM C-band.
Qhia hauv Daim Duab 3 zoo ib yam li qhov tau piav qhia saum toj no hauv Scheme asymmetric band qauv. Hauv cov phiaj xwm no, qhov kev faib rau yoj yoj yog Ib pawg muaj 1470,1490,1510 thiab 1610nm; B band suav nrog 1530,1550,1570 thiab 1590nm. Hauv qhov xwm txheej no, vim hais tias DWDM C-band thiab L-band B-band kom duav txhua qhov, yog li cov tswv yim asymmetric band npaj txhawb kev siv ua ke nrog CWDM thiab DWDM C-band thiab L-band, ua rau lub cev hloov kho tau zoo heev Cov. Txawm li cas los xij, thawj qhov xwm txheej yog ua raws cov qauv ntaus ntawv tsim qauv, qhov xwm txheej thib ob yog rau band-pass lim thiab channel lim modules rau tshwj xeeb passive Cheebtsam thiab tsim.
Ob qhov system CWDM tau hloov kho rau DWDM system
Vim tias qhov qhia txog lub lim dej CWDM thib ob, yog li nws zoo heev txhim kho qhov hloov tau yooj yim ntawm txhua qhov system system. Daim duab 4 yog WDM cov kab ke tshuab yuav nce cov qib ua haujlwm. CWDM cov qauv yooj yim uas pom hauv daim duab 4a, 4b thiab 4c. Hauv daim duab 4a, CWDM bandwidth lim nws tus kheej tsuas yog siv los ua cov lim ywj siab, uas zoo ib yam li ob-channel WDM system, lub kaw lus muaj ob lub wavelengths, ntsig txog, tau hais los saum toj no yuav yog qee qhov ntawm band thiab B band wavelength match. Cov. Txij li qhov no yog ib chav kawm ib leeg, tom qab ntawd ntxig rau theem ob lim lim theem, koj yuav tsum cuam tshuam kev pabcuam.
Txawm li cas los xij, vim ntau qhov tam sim no WDM modules tau nruab nrog TDM kev ua haujlwm, yog li, txawm tias qhov thib ob channel WDM davhlau ya nyob twg tseem tuaj yeem txhawb cov ntawv thov 4,8,16 lossis ntau qhov kev tso cai raws li tus txheej txheem TDM chaw nres nkoj. Raws li pom hauv daim duab 4b thiab 4c yog ob kauj ruam CWDM kev nce qib ntxiv ntawm plaub kis. Piv nrog rau yim-channel module, plaub qhov channel ntawm qhov channel lim module ntawm cov txheej txheem txhim kho tuaj yeem txo qhov kev pib ua lag luam. Daim duab 4d thiab 4e qhia txog CWDM / DWDM kev sib xyaw, uas qhov band-pass lim chaw nres nkoj A thiab chaw nres nkoj B txuas nrog CWDM thiab DWDM ib feem ntawm cov kab ke. Feem ntau, DWDM ntu nws tus kheej muaj DWDM DWDM channel bandwidth lim thiab lim (uas yog ntxiv ob lim). Txawm li cas los xij, tus qauv uas pom hauv Daim duab 4e yuav tsum muaj cov lim dej asymmetric-pass lim, thiab hauv daim duab 4d asymmetrical tus qauv siv tau ob qho tib si rau hauv cov kauj ruam los ua kom muaj kev sib txig sib luag.
Raws li daim duab 4, lub kaw lus muaj ob qhov kev ua tiav tseem ceeb muaj peev xwm ua tau: ib qho yog nyob hauv CWDM cov kab ke ntshiab (daim duab 4 abc) txhim kho; lwm qhov yog thawj qhov kev kho dua tshiab rau CWDM / DWDM hybrid system (daim duab 4 abd), thiab tom qab ntawd txuas ntxiv mus rau FIG 4e.
Cov lus 2 piav qhia qhov sib txawv ntawm cov channel sib thooj hloov yooj yim - cov kauj ruam a, b, d thiab e los muab kev hloov pauv, kom lub peev xwm ntawm lub kaw lus muaj peev xwm nce mus txog 68 raws. Yuav kom ua tiav qhov kev pabcuam tsis muaj kev cuam tshuam, raws li theem a, koj yuav tsum zam ntawm kev ua haujlwm ib leeg. Thiab vim tias los ntawm kauj ruam c, d thiab e hloov kho dua tshiab yuav tsum tau pauv B band CWDM kev coj. Yog li, a thiab c tsis tuaj yeem ua tiav kev hloov khoom dua tshiab yam tsis muaj kev cuam tshuam kev pabcuam.
Piv nrog rau cov qauv kawm ib-theem, qhov uas hais tawm tsam cov tswv yim ntawm ob-theem lim CWDM system muaj ob qhov zoo:
Thaum lub sij hawm ua tiav cov txheej txheem, vim yog siv xws li tus qauv qes ntawm 2,4 thiab 8-channel CWDM cov txheej txheem txhawm rau txhim kho cov channel qhov chaw ntawm cov lim, txo qhov kev nqis peev thaum pib, siv kho dua tshiab yam tsis muaj kev cuam tshuam kev pab cuam, tab sis lub kaw lus kuj txhawb txhua txheem ua raws nrog ITU DWDM channel spacing.
